Personally I wont be using an Assaulter 3. But we can get the max level soldier for other classes? Guerrilla, Radio Op, Engineer etc all level 2.
Even the new Rifleman is max level, 3.
Why not Assaulter 4? The class perk and perk points are far and away, objectively more viable than the crappy Assaulter 3
21-19-20 with 12% reload speed
20-18-19 with 100% medpack restoration